Re: Highest Ranking Woman?
I think it tops out at Dr Ann Mulhall, who had one and a half stripes.
Yes, Ann Mulhall was apparently a lieutenant commander.
All other TOS women were lieutenants, ensigns, or enlisted.
"STAR TREK is... Action - Adventure - Science Fiction."
-- Gene Roddenberry, 1964, top of the first page of his original pitch and outline for Star Trek